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Welding cracked head
Posted: Mon Oct 29, 2007 11:55 am
by dirty dirty 4x4
I have a 2LT with a cracked 3L head my mate works in a shop that among other things weld heads, he has offered to weld mine which i have decided to. It has three cracks between the valves on cyl 1,2,4 (when i do something i do it right) my mate will be cutting out the cracks heating the head and welding i have cleaned it all up and removed the valve sleeves on those cylinders.
1. tho the valve sleeves are still in reasonable condition should they be replaced and if so how much
2. how do you tell how much the head has left to be machined
3. Is there anything you think i should no
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Re: Welding cracked head
Posted: Mon Oct 29, 2007 7:54 pm
by dumbdunce
dirty dirty 4x4 wrote:
1. tho the valve sleeves are still in reasonable condition should they be replaced and if so how much
do you mean the valve seats? yes, replace them. replace the precombustion chambers, too.
dirty dirty 4x4 wrote:
2. how do you tell how much the head has left to be machined
there is NO margin on those heads for machining. you might be able to take off 0.1 - 0.2mm and get away with it but it is very, very likely that with new valve seats plus anythign removed from the head surface, the pistons and valves will become very, very close friends. there should be no need to machine the whole head, just flycut any excess weld off.
dirty dirty 4x4 wrote:
3. Is there anything you think i should no
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sell the car as soon as this repair is complete. it will crack again.
Posted: Mon Oct 29, 2007 9:56 pm
by badger
and buy some chemi weld so you can get home when it does
Re: Welding cracked head
Posted: Tue Oct 30, 2007 2:34 am
by cloughy
dumbdunce wrote:
sell the car as soon as this repair is complete. it will crack again.
Posted: Tue Oct 30, 2007 9:41 am
by dirty dirty 4x4
my other option is a new head can pick one up for $550 bare and put my crap and a 3L cam in and get it set up, does anyone know what sort of price i will be looking at to get it done
Posted: Tue Oct 30, 2007 3:04 pm
by dumbdunce
dirty dirty 4x4 wrote:my other option is a new head can pick one up for $550 bare and put my crap and a 3L cam in and get it set up, does anyone know what sort of price i will be looking at to get it done
this is a far better option. the labour is more or less the same as with the weld job, the labour component would be around the $600 plus or minus $100 region.